Can I Take Magnesium with Jardiance?

What Kind of Interaction Exists Between Magnesium and Jardiance?

The interaction is pharmacodynamic and indirect, not pharmacokinetic. Jardiance does not bind magnesium in the gut, alter its absorption, or change how the liver processes it. Instead, the concern centers on how SGLT2 inhibition changes renal handling of electrolytes, including magnesium, over time.

Empagliflozin works by blocking the sodium-glucose cotransporter-2 (SGLT2) in the proximal renal tubule, causing glucose and sodium to spill into the urine. This shift in tubular solute transport affects other ion channels in adjacent nephron segments, which can raise magnesium excretion modestly in some individuals. The practical question is therefore not "will magnesium interfere with my medication" but "does my medication change how much magnesium I retain."

How SGLT2 Inhibitors Affect Renal Magnesium Handling

The kidney filters roughly 2,400 mg of magnesium per day and reabsorbs approximately 95 percent of it. The proximal tubule handles about 15 percent of that reabsorption, and the thick ascending limb of the loop of Henle handles roughly 70 percent. SGLT2 inhibition acts primarily at the proximal tubule, where it reduces sodium reabsorption. That sodium signal indirectly changes the electrochemical gradient driving paracellular magnesium reabsorption in the loop of Henle, which may increase magnesium losses.

A 2019 analysis published in the Journal of the American Heart Association examining empagliflozin data from the EMPA-REG OUTCOME trial (N=7,020) reported a small but statistically significant rise in serum magnesium of approximately 0.01 to 0.02 mmol/L over 12 weeks in the empagliflozin groups, suggesting the drug may actually modestly preserve or raise serum magnesium rather than deplete it. [1] This finding complicates the simple narrative that SGLT2 inhibitors deplete magnesium.

Contrast With Drugs That Genuinely Deplete Magnesium

Loop diuretics such as furosemide and thiazides such as hydrochlorothiazide unambiguously reduce serum magnesium by blocking tubular reabsorption more aggressively. Proton pump inhibitors (PPIs) cause hypomagnesemia through a gut mechanism, reducing intestinal magnesium absorption. The FDA issued a safety communication on PPI-associated hypomagnesemia in 2011. [2] If a patient takes Jardiance alongside a PPI or a loop diuretic, the combined effect on magnesium balance becomes clinically meaningful and warrants periodic monitoring regardless of supplementation status.

Does Magnesium Supplementation Affect Blood Sugar or Insulin Sensitivity?

Magnesium is a cofactor for more than 300 enzymatic reactions, including several steps in glucose metabolism. Low serum magnesium is associated with insulin resistance, and correcting deficiency may improve fasting glucose modestly. This creates a potential pharmacodynamic overlap with empagliflozin's glucose-lowering action.

Evidence From Clinical Trials

A 2016 meta-analysis in Diabetes Care pooled 18 randomized controlled trials (N=1,160) and found that magnesium supplementation reduced fasting plasma glucose by a mean of 4.85 mg/dL (95% CI: 0.85 to 8.86 mg/dL, P<0.05) in people with diabetes or at high risk for it. [3] The effect was most pronounced in those who were magnesium-deficient at baseline.

Empagliflozin in the EMPA-REG OUTCOME trial reduced HbA1c by approximately 0.5 to 0.7 percentage points at 12 weeks. Both effects are modest, but additive glucose lowering could theoretically increase hypoglycemia risk. The risk is low because empagliflozin itself carries minimal hypoglycemia risk when used without insulin or sulfonylureas. Adding magnesium supplementation to Jardiance monotherapy is unlikely to cause symptomatic hypoglycemia in most patients. However, patients on a regimen that also includes insulin or a sulfonylurea should be aware that the combination of all three agents adds incremental glucose-lowering pressure.

What the Endocrine Society Says About Magnesium and Diabetes

The Endocrine Society's 2022 clinical practice guidelines on micronutrient supplementation in metabolic disease note that magnesium repletion is indicated for documented hypomagnesemia in people with type 2 diabetes, and that supplementing in the absence of deficiency shows inconsistent benefit. [4] The guidelines do not list SGLT2 inhibitors as a contraindication to magnesium supplementation.

Is Magnesium Safe to Take With Jardiance?

For most adults with normal kidney function, magnesium supplements are safe alongside empagliflozin. The combination is not listed as a contraindication or major interaction in the FDA-approved prescribing information for Jardiance. [5] The Natural Medicines database (accessed 2025) classifies the combination as a minor or theoretical interaction, primarily related to overlapping effects on electrolyte balance rather than direct drug interference.

Kidney Function Changes Everything

Empagliflozin is approved for use in chronic kidney disease (CKD) as low as an eGFR of 20 mL/min/1.73m² based on EMPA-KIDNEY trial data (N=6,609), which demonstrated a 28% relative reduction in kidney disease progression or cardiovascular death. [6] Patients with CKD stage 3b (eGFR 30 to 44) or worse have reduced capacity to excrete excess magnesium through the kidneys. In those patients, supplemental magnesium carries a real risk of hypermagnesemia, which can cause neuromuscular depression, cardiac conduction changes, and at extreme levels, respiratory failure.

Patients with advanced CKD who are already on Jardiance should have their nephrologist or prescribing physician approve any magnesium supplement before starting it. The upper tolerable intake level for supplemental magnesium set by the National Institutes of Health is 350 mg per day for adults with normal kidney function; that threshold does not apply to patients with CKD. [7]

Patients Also on PPIs or Diuretics

A patient taking Jardiance, a PPI such as omeprazole, and a loop diuretic such as furosemide is at meaningful risk for clinically low serum magnesium. Each agent reduces magnesium status through a different mechanism: the PPI via gut absorption, the diuretic via renal loss, and the SGLT2 inhibitor via modest tubular effects. In that scenario, checking a serum magnesium level and supplementing to keep levels in the normal range (0.75 to 0.95 mmol/L) is a reasonable clinical action supported by the 2011 FDA PPI safety communication. [2]

Timing: Should You Separate Magnesium and Jardiance?

No published pharmacokinetic study has examined whether magnesium chelates empagliflozin in the gastrointestinal tract the way antacids chelate certain antibiotics. Empagliflozin's oral bioavailability is approximately 78 percent and is not meaningfully affected by food or most divalent cations based on the prescribing information. [5] The standard advice to separate divalent mineral supplements (magnesium, calcium, iron, zinc) from certain drugs by 2 hours applies most rigorously to fluoroquinolone antibiotics, bisphosphonates, levothyroxine, and some HIV medications.

Practical Timing Guidance

A 2-hour separation window between magnesium and Jardiance is a reasonable precaution given the general pharmacology of mineral supplements, even though no specific evidence shows a problem with simultaneous administration. Jardiance is typically taken in the morning. Taking magnesium glycinate or magnesium citrate in the evening is therefore practical and aligns with evidence that magnesium taken at night may support sleep quality in some patients. [8]

HealthRX Clinical Decision Framework: Magnesium + Jardiance

| Patient Profile | Risk Level | Recommendation | |---|---|---| | Normal eGFR (≥60), no PPI, no diuretic | Low | May supplement 200 to 350 mg elemental magnesium daily; recheck serum Mg at annual labs | | Normal eGFR, on PPI or thiazide | Moderate | Check baseline serum Mg; supplement if <0.75 mmol/L; recheck at 3 months | | Normal eGFR, on loop diuretic (furosemide, torsemide) | Moderate-High | Check serum Mg every 3 to 6 months; supplement under physician guidance | | CKD stage 3b or worse (eGFR <45) | High | Do not supplement without nephrology or prescriber approval; monitor serum Mg every 3 months | | Hypermagnesemia history | Contraindicated | Avoid supplemental magnesium; address dietary sources only |

Which Form of Magnesium Works Best Alongside Jardiance?

Not all magnesium supplements are equivalent. The elemental magnesium content and absorption rate differ by salt form, which affects how much reaches systemic circulation.

Comparing Magnesium Salt Forms

Magnesium oxide is the cheapest and most common form but has roughly 4 percent bioavailability in some studies, meaning 500 mg of magnesium oxide delivers only about 20 mg of usable elemental magnesium. Magnesium glycinate and magnesium citrate show absorption rates of 40 to 50 percent in comparative studies and are generally better tolerated gastrointestinally. A 2003 study in the Journal of the American College of Nutrition (N=46) found magnesium citrate raised serum magnesium more effectively than magnesium oxide at the same nominal dose (P<0.05). [9]

Magnesium malate and magnesium threonate are marketed for energy production and cognitive function, respectively, but fewer head-to-head absorption studies exist for these forms.

Dosing Context

The Recommended Dietary Allowance (RDA) for magnesium is 420 mg per day for adult men and 320 mg per day for adult women. Most Americans get about 250 mg per day from diet alone according to NHANES data. [7] A supplement providing 200 to 350 mg of elemental magnesium in a well-absorbed form such as glycinate or citrate is sufficient to close that gap without approaching the upper tolerable limit for supplemental magnesium of 350 mg per day (separate from dietary intake).

Monitoring Magnesium Levels on Jardiance

Routine monitoring of serum magnesium is not required in the FDA prescribing information for empagliflozin. Standard diabetes management panels typically include a comprehensive metabolic panel (CMP), which does not include magnesium unless ordered separately.

When to Add Magnesium to Your Lab Panel

A clinician should order serum magnesium for any Jardiance patient who experiences unexplained muscle cramps, fatigue, cardiac palpitations, or constipation, all of which can be symptoms of hypomagnesemia. The American Diabetes Association's Standards of Care in Diabetes 2024 recommend periodic electrolyte monitoring in people with diabetes who take medications affecting electrolyte balance. [10] Adding a serum magnesium level to an annual lab panel costs under $15 at most commercial labs and provides actionable data.

Target Range and Interpretation

The normal serum magnesium range is 0.75 to 0.95 mmol/L (1.7 to 2.2 mg/dL). Mild hypomagnesemia (0.5 to 0.74 mmol/L) is often asymptomatic but may worsen insulin resistance over time. Severe hypomagnesemia (<0.5 mmol/L) requires medical management, sometimes intravenous repletion if oral supplementation is insufficient or if cardiac arrhythmias are present.

A 2015 observational study in Diabetes Care (N=2,038) found that hypomagnesemia was present in 28.3% of adults with type 2 diabetes compared to 5.5% in normoglycemic controls, underscoring the baseline prevalence of this deficiency in the population most likely to be taking Jardiance. [11]

Drug-Drug Context: What Other Medications Interact With Both Jardiance and Magnesium?

Several medications interact with both empagliflozin and magnesium, creating a three-way clinical picture worth understanding.

Insulin and Sulfonylureas

Empagliflozin combined with insulin or sulfonylureas such as glimepiride increases hypoglycemia risk. Magnesium supplementation adds a small additional glucose-lowering effect. Patients on this combination should monitor capillary blood glucose more frequently when starting magnesium and discuss dose adjustments with their prescriber.

Loop Diuretics

Loop diuretics reduce serum magnesium by blocking the NKCC2 transporter in the thick ascending limb. They also potentiate the volume-depleting effect of SGLT2 inhibitors, raising the risk of dehydration and acute kidney injury. The American Heart Association's 2022 heart failure guidelines note that empagliflozin is often added to diuretic-based regimens in heart failure with reduced ejection fraction. [12] In those patients, a quarterly serum magnesium check is a practical safeguard.

NSAIDs

Non-steroidal anti-inflammatory drugs reduce renal prostaglandin synthesis, which blunts the natriuretic and glucose-lowering effects of SGLT2 inhibitors and may impair magnesium excretion by reducing GFR. Chronic NSAID use alongside Jardiance warrants careful kidney function monitoring.

What Clinicians Say About This Combination

Dr. Mikhail Kosiborod, a cardiologist who served as principal investigator on the EMPEROR-Preserved trial evaluating empagliflozin in heart failure with preserved ejection fraction, stated in a 2023 NEJM Evidence commentary: "Electrolyte balance, particularly potassium and magnesium, deserves routine attention when SGLT2 inhibitors are combined with renin-angiotensin-system agents and diuretics in heart failure populations." [13]

The American Association of Clinical Endocrinology (AACE) 2023 Diabetes Management Algorithm explicitly calls out micronutrient deficiencies, including magnesium, as modifiable factors in glycemic management, recommending correction of deficiency before concluding that pharmacotherapy is suboptimal. [14]

Dietary Magnesium Sources Worth Knowing

Before reaching for a supplement, it helps to know the richest dietary sources of magnesium, especially because food-form magnesium does not count against the 350 mg upper limit for supplemental magnesium.

Pumpkin seeds provide about 168 mg of magnesium per ounce, making them one of the most concentrated sources. Dark chocolate (70 to 85 percent cacao) provides approximately 64 mg per ounce. Cooked black beans provide about 60 mg per half-cup, and almonds provide about 80 mg per ounce. Patients on a diabetes-focused eating pattern who already eat legumes, nuts, and seeds regularly may not need supplemental magnesium at all.

Measuring dietary intake using a 3-day food record or a validated food frequency questionnaire provides cleaner data than guessing before defaulting to a supplement.

Practical Takeaway for Patients Already Taking Both

If you are already taking a magnesium supplement alongside Jardiance and have not experienced any adverse effects, continuing is reasonable. Ask your prescriber to add serum magnesium to your next routine lab draw. If the result is within the normal range (0.75 to 0.95 mmol/L), your current regimen is working and no adjustment is needed. If the result is below 0.75 mmol/L despite supplementation, your prescribing clinician may want to evaluate your overall medication list for additive depleters or consider switching to a more bioavailable form such as magnesium glycinate at 300 mg elemental magnesium per day.